Hearing Loss Linked to Mental Decline in Elderly

Jan. 22, 2013 -- Hearing loss and mental decline are two common conditions of aging, and now a new study finds that they may be related.

Older people with hearing deficits were more likely than those with normal hearing to develop problems with memory and thinking over the course of the study.

On average, the study participants with hearing issues had significant mental impairments three years earlier than those without them.

Untreated Hearing Loss Common

About two-thirds of adults over the age of 70 have some degree of hearing loss.

And the number of people with dementia is projected to double over the next two decades as the population ages.

The researchers now hope to study whether hearing aids can slow mental decline in the elderly.

Otologist and epidemiologist Frank R. Lin, MD, PhD, led the study. He says only about 15% of people who need hearing aids get them. Lin is an assistant professor at the Johns Hopkins University School of Medicine in Baltimore.

“Our findings emphasize just how important it is for physicians to discuss hearing with their patients and to be proactive in addressing any hearing declines over time,” he says.

The investigation included close to 2,000 men and women in their 70s and 80s who took part in an aging and health study that began in the late 1990s.

Hearing was tested in year five of the study, and the men and women underwent a series of tests over the next six years to assess declines in memory and thinking.

The men and women with hearing loss showed evidence of these declines 30% to 40% faster than the people with normal hearing. And those people with more hearing loss had steeper declines in mental function.

The study was published online in the journal JAMA Internal Medicine.

Social Isolation, Brain Overload May Explain Link

While it did not address how age-related hearing loss may worsen problems with memory or thinking, Lin says there are several theories.

One theory is that the social isolation common among people with untreated hearing loss leads to mental decline. Previous research has identified loneliness as a risk factor for such decline, he says.